How to restore column widths in a JTable?

问题

My question is clear. Is there any way to restore the width of the columns automatically after user has resized them?

Every time the button is clicked, I want the column widths to be restored.

public class TableTest {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame("");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setLayout(new BorderLayout());

            JTable table = new JTable(new Object[][] { { "something", "something else" } },
                    new Object[] { "Col1", "Col2" });
            table.getColumnModel().getColumn(0).setCellRenderer(new DefaultTableCellRenderer() {

                @Override
                public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,
                        boolean hasFocus, int row, int column) {
                    JLabel label = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row,
                            column);
                    label.setForeground(Color.GREEN);
                    return label;
                }
            });
            frame.add(new JScrollPane(table), BorderLayout.CENTER);

            JButton button = new JButton("Button");
            button.addActionListener(e -> {
                // Restore column widths here
            });
            frame.add(button, BorderLayout.PAGE_END);
            frame.pack();
            frame.setLocationByPlatform(true);
            frame.setVisible(true);
        });
    }
}

I tried:

table.setAutoCreateColumnsFromModel(false);
table.setAutoCreateColumnsFromModel(true);

But it removes the renderer.

I tried:

table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);

But does nothing.

I tried:

for (int col = 0; col < table.getColumnCount(); col++) {
    table.getColumnModel().getColumn(col).sizeWidthToFit();
}

Bot does nothing.

Is there a way? Or I have to calculate it myself and then getColumnModel.getColumn(..).setPreferredWidth(..) ?

回答1:

You need to manage this yourself.

By default the width is set to 75, so you can just reset the width to 75.

Or you can always query the width of the column after the GUI is visible. Then restore the width based on this value.

There is no default functionality to display the column at its original width

来源：https://stackoverflow.com/questions/63346826/how-to-restore-column-widths-in-a-jtable

标签

java

swing

jtable